/ əˈmɪʃn; NAmE / noun
1.
[ U ] omission (from sth) the act of not including sb/sth or not doing sth; the fact of not being included / done :
Everyone was surprised at her omission from the squad.
The play was shortened by the omission of two scenes.
( formal )
sins of omission (= not doing things that should be done)
2.
[ C ] a thing that has not been included or done :
There were a number of errors and omissions in the article.
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WORD ORIGIN
late Middle English : from late Latin omissio(n-) , from the verb omittere , from ob- down + mittere let go.